As of 2 years ago when I left the position of Director of Waterfront Operations and Training at KP we were using that matrix to count midshipmen sea time, and it had been pretty recently implemented. Midshipmen at all schools are getting 1.5 day when underway. For mids who were short days we would sometimes do overnight trips on training vessels over 75 tons from 1600-0800 which count as 3 days. I'm quite sure this is still the policy today.